Add an env variable to disable SSL

[B-i-t-K]

I've added a new env variable to disable SSL This is usefull if you already have a reverse proxy on front. I was in the same setting as issue #1

Possible update: Maybe adding an other variable to keep the secure flag on cookies.

secure: process.env.SSL_ENABLE === 'true'

[rsrdesarrollo]

Hi, will this PR be merged any time soon?